Waste Water Engineering If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is 200 ppm 150 ppm 100 ppm 50 ppm 200 ppm 150 ppm 100 ppm 50 ppm ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is None of these 200 ppm 225 ppm 250 ppm None of these 200 ppm 225 ppm 250 ppm ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering The detention time (t) of a settling tank, may be defined as the time required for The flow of sewage to fill the tank None of these A particle to travel along its length A particle to travel from top surface to bottom sludge zone The flow of sewage to fill the tank None of these A particle to travel along its length A particle to travel from top surface to bottom sludge zone ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering In the activated sludge process Sludge is activated by constant stirring Aeration is continued till stability Aeration is done with an admixture of previously aerated sludge Water is removed by centrifugal action Sludge is activated by constant stirring Aeration is continued till stability Aeration is done with an admixture of previously aerated sludge Water is removed by centrifugal action ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of Nitric acid Hydrochloric acid Sulphuric acid Citric acid Nitric acid Hydrochloric acid Sulphuric acid Citric acid ANSWER DOWNLOAD EXAMIANS APP
Waste Water Engineering The normal values of over flow rates for secondary sedimentation tanks, ranges between 80,000 to 10,000 litres/sqm/day 25,000 to 35,000 litres/sqm/day 50,000 to 60,000 litres/sqm/day 40,000 to 50,000 litres/sqm/day 80,000 to 10,000 litres/sqm/day 25,000 to 35,000 litres/sqm/day 50,000 to 60,000 litres/sqm/day 40,000 to 50,000 litres/sqm/day ANSWER DOWNLOAD EXAMIANS APP
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